Transmission for bicycles



E. MELNICHUK. v

TRANSMISSION FOR BICY'CLES.

- APPLICATION FILED SEPT. 2s. I9I9.

1,334,108. l Patented IIIfIr.16,1920.

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' INVENToR. E-PEM MEL/v/CHUK 2M Pg Patemed Mar. I6, 1920.

2 SHEETS-SHEET 2.

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A TTORNEY.

E. IVIELNICHUK.

TRANSMISSION FOR BICYCLES APPLICATION FILED SEPT. 25, 1919.

mame@ EFREM 'MELNICHUIL 0F CHESTER, CONNECTICUT.

TRANSMISSION FOB BICYCLES.

Specication of Letters Patent.

Patented Mar. 16, 1920.

Application led -S'eptember 25, 1919. Serial No. 826,229.

T o all whom t may concern:

Be it known that I, EFREM MELNICHUK, ya citizen of Russia, residing at Chester, county of Middlesex, and State of Connecticut, have invented certain new and useful Improvements in Transmissions for Bicycles,.

of which the following is a specication.

This invention has as its principal object, the provision of means whereby'the speed of a bicycle or like vehicle maybe accelerated or retarded by the operator in a con. venient manner.

A further object is to provide the pedal mechanism'with change gears directly connected with the actuating mechanism of the vehicle thereby avoiding' chains, belts and like forms of drivers and presenting a .neat appearing structure.

These and other like objects are attained by the novel construction and combination e of parts, hereinafter described and shown in the accompanying drawings, forming a material part of this disclosure, and in which- Figure 1 is a side elevational view showing a bicycle made inl accordance with the invention. i

Fig. 2 is a bottom plan view of the same.

Fig. 3 is an enlarged fragmentary top plan view showing the shifting device.

Fig. 4 is a transverse sectional view taken on line, 4-4 of Fig; 6.

Fig. 5 is a horizontal sectional view through thel center of the gear casing, and7 Fig. 6 is a similar view of the casing showing the parts in another position.

Referring to the drawings in detail, the numeral "10 indicates the front wheel of the vehicle and 11 the'V rear, the front Wheel being engaged by the front forks 12 and the rear wheel by the correspondin rear `forks 13, these beinga part of` a stan ard or con-4 ventional type ofbicycle'frame comprised of the front fork sleeve 14,-and front and rear strut elements 15 and 16, connected at their upper ends with the horizontal bar 17, above .which extends a steering handle 18 and a seat 19 convenient forthe'operator.

A pair of horizontal bars 2O are engaged at their front ends with a cylindrical casing 21hv having 4a removable cover 22 as mdicated in Fig. 1. The'rea wall 23 of the mounted a spindle 24 having attached at its casing, together with the cover has inwardly extending hubs in which are rotatably extending ends cranks 25, their outer ends having pivoted upon them pedals 26 of the usua-l type of construction and operated in a well known manner.

Attached to the spindle 24 close to the inner hub extending from the casing 23, is a relatively large bevel gear 28 having ailixed to its face a similar but smaller gear 29.

Rotatably mounted upon the spindle 24 is the hub 30 of anparm 31 integrally formed with the transverse sleeve 32 in which is rotatably mounted a spindle 33, carrying near 'the ends of the sleeve, pairs of eccentrics 34 and 35, these eccentrics being mounted in the parallel elements of the yoke loops 36 and 37, respectively inner and outer,

lin which in turn, are engaged at their outer ends with the hubs of other bevel gears 38 and 39.

These gears are slidably mounted on a spindle 40 which extends outward from the casing 21, passing through a bearing 47 and is provided at the outer end with a worm 48 engaged with the teeth of the worm gear 49 fixed on the rear or driving shaft of the vehicle.

The spindle 33 passes through a guide 41, connected to the horizontal bar 17 and on which is mountedl a stationary disk 42 containing recesses 43 engageable with a plunger detent 44, actuated by the crank handle 45, so that the same may be shifted from one side'to the other, into either of the recesses 43, thereby partially lrotating the vertical spindle 33 an'd the gears'38 or 39 into engagement with the gears 28 or 29 as maly be required.

n operation, the parts having been assembled' as indicated, upon actuating the pedals 26, rotary motion is conducted through 'the cranks 25 to the gears 28 and 29 which are engageable with either of the in Fig. 6the gears 28 and 39 are in engage- 4 ment, causing a more rapld rotation of the shaft 40, by the same number of revolutions of the pedal spindle 24, in a manner which will be readily understood.

From the foregoing it will be apparent that in climbing hills, passing through sand or other hard going, ythe low speed gears maybe placed 1n position by actuating the handle 45 from the riding seat and constantially horizontal from aving thus described my invention and set 4forth the manner of construction and use, what I claim as new and desire toy secure by Letters Patent, isi Ina transmission device for bicycles, the combination with. a frame having a steering and a driving Wheel, said driving Wheel being adapted for Worm operation, of a gear easing carried by said frame between said wheels, a crank axle journaled in said casing, said axle having pedals at the ends thereof, a relatively large bevel gear xed upon said aXle in said casing, a smaller bevel gear secured upon the face ot'tne larger gear, a Worm shaft extending subsaid casing adapted to actuate said drive Wheel, a pair of gears secured in tandem upon said Worm shaft Within said casing, one of said bevel gears being engageable with the smaller of the rst'named bevel gears and the other with the larger of said bevel gears, yokes engaging the hubs of the last named bevel gears whereby they may be moved longiltudinally on said e worm shaft, eccentries for actuating said yokes, a spindle upon which said ecentrics are mounted, said spindle extending upward to the upper element of said frame, a crank fixed upon said spindle, and lneans for holding saidcrank in either of -two positions whereby either of said sliding bevel gears may be lneshed with said driving gears.

'ln testimony Whereof' have aflixed my signature.

EFREM MELNICHUK. 

